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MEP-003A stalling under high load test?

M

Mr4btTahoe

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Light in the Dark said:
Clicking does not equal pumping. It should... but it doesn't always. Have you removed the particle filters and caps and cleaned them?

According to Pegasus racing, that pump has "Maximum fuel delivery 33 gallons per hour at free flow", so assume about a half gallon per minute max flow. Sounds like you are getting less than that.
Click to expand...
I don't have factory filters. The unit has been converted to spin ons for everything.

I am getting less flow than that after the filters bank. The clicking while the line is off is fairly rapid while unhooked from the pump but substantially slower when hooked up to the IP. Return fuel at the tank is a trickle at best (not running).
 
Light in the Dark

Light in the Dark

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Mr4btTahoe said:
I don't have factory filters. The unit has been converted to spin ons for everything.

I am getting less flow than that after the filters bank. The clicking while the line is off is fairly rapid while unhooked from the pump but substantially slower when hooked up to the IP. Return fuel at the tank is a trickle at best (not running).
Click to expand...
If you have the correct fuel pumps, there are caps you can remove off the bottom with a twist, and there should be 'basket' strainer filters inside of each pump that can get gummed up and restrict flow. Thats what I meant, for clarification.
 
M

Mr4btTahoe

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Light in the Dark said:
If you have the correct fuel pumps, there are caps you can remove off the bottom with a twist, and there should be 'basket' strainer filters inside of each pump that can get gummed up and restrict flow. Thats what I meant, for clarification.
Click to expand...
It's been a bit. I'll check that the next time I'm out. I cleaned them when I first got the unit but had to line the fuel tank due to rust issues. It's possible that it picked up some junk from the tank.
 
Guyfang

Guyfang

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The fuel pumps should slow down when hooked to the IP. When first turned on, they should run faster, but slow down when they have charged the fuel system. Thats normal. And, as LITD wrote, ticking is not always pumping.
 
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Chainbreaker

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Another consideration... Do your fuel pumps still have the "inline capacitors" installed in the leads that power them? These units are getting old and things like an old "inline capacitor" might slowly fail, becoming intermittent over time, potentially affecting fuel output pressure if the pumps are pumping intermittently & can't keep up with load.

I'm going to cut all my inline caps out to eliminate that potential failure point. I'm not at war & don't care if I am "electronically detectable".
 
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M

Mr4btTahoe

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It's been a hot minute but wanted to give an update to this issue.

After much digging, I never really got anywhere. Governor adjustments did nothing to solve the problem and as time progressed, the issue got worse.

6 months or so after my last post, it wouldn't hold a 5k load without stalling. I ordered injector nozzles but it got out on the back burner until today.

I went to fire it up a few days ago and it would barely start and wouldn't come up on rpm at all. Tore into the fuel system... Pumps all clean. Great fuel flow at the IP.

Pulled the injectors to replace the nozzles. 3 of the 4 were frozen. Got it all buttoned up and it wouldn't fire at all. No smoke... No nothing. I was ready to pull the IP when I decided to pull the center cap on it instead. When I did, the holder under the cap spun out with the cap. Somehow or another, the holder under the cap had worked loose. Perhaps I didn't have it tight enough from when I went through the pump years ago. Reinstalled the holder and snigged it down "goodntite". Put the cap back on and hit the switch. The unit fired instantly with a little puff of Black smoke from the exhaust and went right up to operating RPM.

I've not been able to put a heavy load on it yet but it's running substantially better than it ever has and starts much easier. I'm thinking the old injectors were stuck open slightly and weak which let the IP which was putting out low pressure still get enough fuel to it to run. With the new nozzles in place, the IP couldn't build enough pressure to pop the injectors.

Anyways... It ran like a top for an hour with a light load on it. I'll get my home brew load bank set back up here soon and test it out again.

Sorry for the long delay... better late than never I suppose.

-Chris
 
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